plant communication

some plants have evolved a survival strategy that involves the chemical equivalent of sending out a distress call

Plants have memories

Certainly plants don't "remember" the way humans do, but a group of researchers discovered that plants learn to associate various wavelengths of light with different kinds of danger

Plants create communication networks

Plants don't just yell for insect help when attacked — they also warn each other of impending doom. Strawberry, clover, and other ground plants grow by sending out "runners," horizontal stems that eventually bud into their own plants

Plants grow differently in response to sound

Australia biologist Monica Gagliano found that corn plants could emit and respond to sound. Gagliano noticed that the roots of corn plants made clicking noises at around 220 Hz

Plants measure time

Scientists have recently identified a set of proteins in plants that respond to the amount of light they're exposed to during the day. When they receive enough light per 24 hour period, these proteins send a signal that activates the flowering cycle

Plants know up from down

No matter how they are positioned, plants will aim their roots downward, into the ground. It's likely that they sense gravity, just the way their ambulatory cohorts do.